P. R. Kofsky

Muscle strength and aerobic power--a study of lower-limb disabled males.

G. Davis, R. Shephard, R. Jackson, 1985, International rehabilitation medicine.

Field testing: Assessment of physical fitness of disabled adults

Glen M. Davis, Roy J. Shephard, Robert W. Jackson, 2004, European Journal of Applied Physiology and Occupational Physiology.

Cardiorespiratory fitness and muscular strength of wheelchair users.

G. Davis, R. Shephard, P. R. Kofsky, 1981, Canadian Medical Association journal.